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Kozlova, E.

Paper Title Page
THPP082 Residual Activity Induced by High-energy Heavy Ions in Stainless Steel and Copper 3551
 
  • I. Strasik, I. Hofmann, E. Kozlova, E. Mustafin
    GSI, Darmstadt
  • L. N. Latysheva, N. Sobolevskiy
    RAS/INR, Moscow
  • M. Pavlovic
    STU, Bratislava
  • A. Smolyakov
    ITEP, Moscow
 
  The activation of accelerator structures due to beam loss is already intensity limiting problem for existing (SNS or RHIC) and planned (LHC or FAIR) hadron facilities. While beam-losses of 1 W/m are recognized as a tolerable beam-loss level for proton machines, the beam-loss tolerances for high-power heavy-ion accelerators have not yet been quantified. In this work the residual activity was calculated by Monte-Carlo particle transport codes and compared with experimental data. Simulations were performed for projectiles from proton to uranium. Experiments were performed with uranium ions at 120, 500 and 950 MeV/u irradiating copper and stainless steel targets. It was found that the isotope inventory contributing over 90% to the total activity does not depend on the projectile species, it depends only on the target material and projectile energy. This allowed establishing a scaling law for induced activity as a function of ion mass. The activity per nucleon induced by ion scales down with increasing ion mass. For example, 1 GeV/u uranium ion induces 5-times less activity per nucleon compared to 1 GeV proton. The beam-loss criteria for different projectile species are presented.